Edit Outlook Auto Complete Addresses With NK2View

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NK2Vuew is a free utility that allows you to edit the entries in your username.nk2 file where username is the name of your Outlook profile. The .nk2 file is where your email addresses are stored that are used for the autocomplete feature. This is different that the addresses stored in your address book.

Each time that you send a new message in Outlook, the emails that you type in To/Cc fields, are automatically inserted into the AutoComplete list, so in the next time that you type an email address, Outlook automatically completes the right email address for you.

The AutoComplete file of Outlook is stored under [Your Profile]\Application Data\Microsoft\Outlook , and it always saved as the profile name of Outlook with .NK2 extension.

This utility reads the AutoComplete file of Outlook (with .NK2 extension), displays all email records stored in it, and allows you to easily export these records into text/html/xml file.

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You can add new AutoComplete items directly from your address book. In order to use this feature, close your Outlook, choose the "Add Items From Address Book" from the File menu, and then select the items that you want to add.
be aware that the number of AutoComplete items that are allowed in NK2 file is limited to 1000. There is a known issue with the program that if you try and add addresses to your file then it may corrupt your .nk2 file so be careful.

With NK2View you can delete unwanted email addresses from your autocomplete file and add new addresses from your address book as well as edit current email address entries. NK2View allows you to delete unwanted/obsolete AutoComplete items. After you delete the items, Outlook won't display them in the AutoComplete combo-box.

You should backup your .nk2 file just in case you delete something that you needed.